This high quality star nut driver for inserting the star-fangled nut found on threadless headset system It is a great portable tool for bike repair tool, home bike mechanic and outdoor cycling Upgraded design for easier operation and long handle prevents your hands from hurt Simply slide the outer sleeve over the steering tube, drop the star nut, alignment the fork tube with the pin part and then give it a tap with a rubber mallet and done. Precision control makes the star nut inserted stably without worrying overwhelming operation.